// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_COMMON_ANDROID_GIN_JAVA_BRIDGE_VALUE_H_
#define CONTENT_COMMON_ANDROID_GIN_JAVA_BRIDGE_VALUE_H_

#include <stdint.h>

#include <memory>

#include "base/macros.h"
#include "base/pickle.h"
#include "base/values.h"
#include "content/common/content_export.h"

// In Java Bridge, we need to pass some kinds of values that can't
// be put into base::Value. And since base::Value is not extensible,
// we transfer these special values via base::BinaryValue.

namespace content {

class GinJavaBridgeValue {
public:
    enum Type {
        TYPE_FIRST_VALUE = 0,
        // JavaScript 'undefined'
        TYPE_UNDEFINED = 0,
        // JavaScript NaN and Infinity
        TYPE_NONFINITE,
        // Bridge Object ID
        TYPE_OBJECT_ID,
        TYPE_LAST_VALUE
    };

    // Serialization
    CONTENT_EXPORT static std::unique_ptr<base::BinaryValue>
    CreateUndefinedValue();
    CONTENT_EXPORT static std::unique_ptr<base::BinaryValue> CreateNonFiniteValue(
        float in_value);
    CONTENT_EXPORT static std::unique_ptr<base::BinaryValue> CreateNonFiniteValue(
        double in_value);
    CONTENT_EXPORT static std::unique_ptr<base::BinaryValue> CreateObjectIDValue(
        int32_t in_value);

    // De-serialization
    CONTENT_EXPORT static bool ContainsGinJavaBridgeValue(
        const base::Value* value);
    CONTENT_EXPORT static std::unique_ptr<const GinJavaBridgeValue> FromValue(
        const base::Value* value);

    CONTENT_EXPORT Type GetType() const;
    CONTENT_EXPORT bool IsType(Type type) const;

    CONTENT_EXPORT bool GetAsNonFinite(float* out_value) const;
    CONTENT_EXPORT bool GetAsObjectID(int32_t* out_object_id) const;

private:
    explicit GinJavaBridgeValue(Type type);
    explicit GinJavaBridgeValue(const base::BinaryValue* value);
    std::unique_ptr<base::BinaryValue> SerializeToBinaryValue();

    base::Pickle pickle_;

    DISALLOW_COPY_AND_ASSIGN(GinJavaBridgeValue);
};

} // namespace content

#endif // CONTENT_COMMON_ANDROID_GIN_JAVA_BRIDGE_VALUE_H_
